<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>let 命令</title>
<script>
 let { b, c, ...rest } = { a: 10, b: 20, c: 30, d: 40 };
 console.log(b); // 20
 console.log(c); // 30
 console.log(rest); //{a: 10, d: 40}
 </script>
 </head>
 <body></body>
 </html>